Mixer for fluid-fuel burners.



W. C. LINDEIVIANN & K. D. CAMP.

MIXER FOR FLUID FUEL BURNERS.

APPL|cAT|n'N FILED ocT. 21, 1914.

1,170,765. Patented Feb.8,1916.

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WALTER C. LINDEMANN AND KEY D. CAMP, OF MILWAUKEE, WISCONSIN, ASSIG'NOES T0 A. J'. LINDEMANN & HOVERSON C0., 0F MILWAUKEE, WISCONSIN.

MIXER FOR FLUID-FUEL BURNERS.

Specification of Letters Patent.

Patented Feb. 8, 1916.

Application iled'October 21, 1914. Serial No. 867,851.

l cocks designed especially for controlling either natural or artificial gas utilized in supplying fuel burners.

The primary object of our invention is to lprovide a simple, economical, accurately adjustable gage cock' of the above type so arranged and constructed as to relieve back pressure or friction and to discharge a prolonged unbroken column of gas into the burner tube, whereby perfect combustion is maintained under the varying` low press'ure conditions of either type of fuel gas mentioned.

The invention therefore embodies as its essential features a fluid supply nipple having an orificed tip provided with internal conical walls, which conical walls converge toward the discharge orifice to form a chokebore. The tip thus formed is equipped with a plug incased therein having a conically beveled end corresponding' in pitch to the conical bore of thetip', whereby the tapered surfaces of said tip and plug together form a parallel conically disposed smooth fluid discharge throat leading to the orifice, whlch throat is adjustable by a telescopic action with relation to the tip and plug to thus contract or expand the throat in order to adjust the fuel supply.

By practical demonstrations and use, 1t has been found t-hat variousv defects of operation encountered under certain conditions by the usual types of fluid cocks are remedied by embodying a -constructlon whereby a conical discharge throat is formed leading to the tip orifice having no surfaces to present back pressure or resistance to the ow. This construction, as shown in Figure 1 of the drawings, to be hereinafter more fully described, will produce a thin penclllike prolonged column of gas that is discharged in-axial alinement with the burner tube and orifice across the mixing chamber at all adjustments from zeroto full capacity of the," cock, whereby the force of amount of oxygen is added to the gas for t-he purpose mentioned, attention being called to the fact that the point of the plug projects beyond the orifice toproduce the effect of a guiding finger for the gas column.

Our invention also contemplates the ad j ustment of eitherthe plug or tip member,

whereby the conical throat is contracted or',

expanded to vary the quantity of gas supplied to the burner under all conditions both as to volume and richness.

Our invention also contemplates'the em'- bodiment of a simple and economical mixing-chamber in connection with the cock, together with means for varying the air inlet ports, whereby the supply of air to the burner is controlled and admitted uni.. formly about the solid column of gas which is discharged through the mixing chamber and into the burner tube.

With the above objects in view the invention consists in certain peculiarities of construction and combination of parts as set forth hereinafter with reference to the accompanying drawings and subsequently claimed.

In the drawings Fig. 1 represents a sectional elevation of an adjustable fluid cock embodying the features of our invention; Fig. 2, is a magnified view of the discharge end of said cock with parts broken away and in section to more clearly illustrate the invention; Fig. 3, 'is a detailed cross-section through the discharge end of said cock, the section being indicated by line 3--3 of Fig. 1.

Referring by characters to the drawings, l represents a fragment of a gas main or `header pipe into which is threaded the intakeend of a valve-casing 2, which casing visp'rovided with a tapered plug 3 that is interposed between the intake duct 2 and the discharge duct 2". The' plug is held to its seat by a headed screw 4, between the head of which screw and a collar 4" is interposed a section of coiled sprino' 4,

let nipple 6 of the valve casing, the external surface of which nozzle is lthreaded. The outer end of the expansion chamber 5 of said nipple is internally threaded for the reception of a correspondingly threaded fiat head 7 of a cylindrical plug 7, which plug is of considerably less diameter than the diameter of the expansion chamber,

rear end of a tip 8, which rear-end, for the purpose of convenience in adjustment, is preferably formed with a polygonal head, as shown. The tip is cylindrical 1n form l and provided with an external smooth surface over which is slidably fitted the end sleeve 9 of a-mixing cup 10, the construction of which will be hereinafter more fully described. The discharge end of the tip 8 is, as shown, preferably formed with a con cave basin 11 therein, the-center of which basin merges into a circular discharge orifice 11', the said orifice being of slightly less diameter than the diameter of the plug 7. The tip is formed with an internal gas chamber 12 through which the plug 7 projects, the walls 12 of said chamber being adapted to converge from the-threaded portion of the tip to the mouth of the orifice, whereby the chamber is conical in form and is contracted toward the orifice to provide a choke-bored throat in connection with the tapered surface of the plu end 7 which tapered'surface is, as clear y shown in Fig.v

2, approximately parallel with the tapered walls ofthe tip throat.

As shown in Figs. 1 and 2 of the drawings, the tip is arranged to beiadjusted back and forth upon the nipple 6, whereby the converging or conical discharge throat may be contracted or increased to adjust the flow of gas from ,the orifice about the plug end Tf', which plug end ,projects beyond the orifice, vwhereby it constitutes a lead finger for the gas. The concave basin 11 of the tip will thus, under all conditions, while permitting exposurel of the point of the plug, protect the same from being marred.

The preferred form of mixing cup 10, as

shown, is provided with a cover-plate 10 having air inlet ports 10 therein, the said cover-plate "being secured to the sleeve` 9, which is centrally disposed with relation to the cup. Mounted upon the sleeve 9 is an adjustable disk 13, which disk is adapted to -be moved in or out with relation to the surface of the cover-plate, whereby the amount of air admitted to the mixing cup or cham.

ber is varied. The disk 13 is in threaded .union with the sleeve 9 and is also locked in its adjusted position upon said sleeve by a set-screw 13. The mixing chamber cup is, in this instance, provided with an inner threaded end for union with a burner tube 14 that constitutes a neck which extends from any type of ordinary gas burner.

From the foregoing it will be observed that the supply of gas enters the nipple expansion chamber 5 and from thence to the conical tip chamber 12, passing about the fiat head 7 of the plug 7. The core stratum of the gas travels along the conical plug to the contracted throat and fromrthence follows the inclined surface of the tapered plug point. The outer surface of the gas is de- =liected in a gradual sweep downward to the contracted throat, together with the intermediate gases, without coming in contact with any obstructions, a full sweep of the entire volume of gas being toward the orifice under a gradual contracting condition. The gases, after entering the parallel tapered throat are thereby compressed and travel for a certain space under said compressed condition. Thereafter at the mouth of the orifice the outer or surface gas is discharged in a straightline, as indicated by the dotted line and arrows, to form a pencil-like column and the core surface of the gas which follows the tapered plug will also strip off from said plug atl the line of the orifice, whereby the direction of the column is maintained axially with relation to the plug and burner tube. This solid column of gas is maintained,vfor' example, approximately 2V inches from the point of discharge and enters the tube for a predetermined distance before diffusing. Thus the velocity of the expelled column causes a uniform volume of air to be drawn into. the mixing chamber that commingles at the spray point of the column to add sufficient oxygen for perfect combustion, from which point the mixture travels to the burner tips or flames for consumption.

In connection with maintaining the column of gas illustrated and described, it will be observed that, owing to the fact that air is admitted in equal quantities about the surface of the column in all directions, its tendency will be tomaintain the alinement of tance being given to the fact that there are no sharp angled or opposing surfaces to conflict With the approximate free travel of said gas from. the discharge duct 2 to the tip orifice.

We claim:

l. In a structure of the class described the combinationwith a valve including a discharge nipple of a sleeve threaded on the discharge nipple and extending outwardly thereof With its outer bore portion reduced, a plug in the sleeve for coaction with "said reduced portion and a flattened head on the plug threaded in the discharge nipple.

2. In a 'structure of the class described the combination of a sleeve member having its bore taperingly reduced at one end, a plug in the sleeve having one end taperingly reduced at a pitch corresponding With the pitch of the said reduced bore, and said reduced end of the bore being enlarged adjacent the end of the sleeve to form a cupped portion' at said end of the sleeve into Which the end of the plug projects and a mixing sleeve to coact with said reduced end, a second sleeve loose on the first sleeve, a mixing tube disposed axially with respect to the sleeves7 a'n apertured end plate carried by the mixing tube and secured to the loose sleeve and an air adjusting disk adjustably carried on the loose sleeve.

In testimony that We claim the foregoing Wev have hereunto set'our hands at Milwaukee in the county of Milwaukee and State of Wisconsin in the presence of two Witnesses.- i

WALTER C. LINDEMANN. KEY D. CAMP. Witnesses: WM. A. HAASE,

EDWIN` HENES.4v 

